When using LandView 5 or LandView 6 to update my Risk Management Plan, how do I report the Horizontal Reference Datum Code and Horizontal Accuracy Measure?
The roads, hydrography, and railroad features in both LandView 5 and LandView 6 are based on the Census 2000 TIGER/Line files. This version of TIGER/Line is based on the North American Datum of 1983 (NAD83). For Hawaii and the Pacific Island Areas, the Census Bureau used a variety of sources for building the original digital file in the late 1980s. Neither the specific identities of each of these sources nor their datums were recorded. Because of the variety of sources contained in TIGER, it is not possible to provide a single number representing the horizontal accuracy measure. A fuller explanation of positional accuracy is presented in Chapter 5 of the Census 2000 TIGER/Line technical documentation [PDF] which may be downloaded. The EPA has developed the TRI Facility Siting Tool to allow facilities that submit Toxic Release Inventory (TRI) reports to obtain their latitude and longitude. This tool may also be used by facilities submitting Risk Management Plans (RMP). The tool asks you
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